Can you explain the plural of tardy?

The plural of "tardy" is tardys. However, it's important to note that "tardy" is usually used as an adjective, describing someone or something as late. So, you would typically use the plural form of a noun that "tardy" modifies.

For example:

* "There were several tardy students in the class." (Here, "tardy" modifies the noun "students")

* "The tardys were sent to the principal's office." (This is grammatically correct, but it sounds awkward and is not a common usage.)

It's more natural to say something like: "The students who were tardy were sent to the principal's office."